对数组内返回的值执行foreach

Question

我不确定我是否正确地提出了这个问题，但基本上我从WordPress得到以下数组结果我试图处理：

Array
(
    [0] => WP_User Object
        (
            [data] => stdClass Object
                (
                    [ID] => 3
                    [user_login] => Jean Gomes
                    [user_pass] => $P$BvW6LK9/blGKLuSj.9spNPW3.v104..
                    [user_nicename] => jean-gomes
                    [user_email] => jean.gomes@dpa.dev
                    [user_url] => 
                    [user_registered] => 2014-08-28 10:56:39
                    [user_activation_key] => 
                    [user_status] => 0
                    [display_name] => Jean Gomes
                )

            [ID] => 3
            [caps] => Array
                (
                    [author] => 1
                )

            [cap_key] => dpa2335327_capabilities
            [roles] => Array
                (
                    [0] => author
                )

            [allcaps] => Array
                (
                    [upload_files] => 1
                    [edit_posts] => 1
                    [edit_published_posts] => 1
                    [publish_posts] => 1
                    [read] => 1
                    [level_2] => 1
                    [level_1] => 1
                    [level_0] => 1
                    [delete_posts] => 1
                    [delete_published_posts] => 1
                    [wpseo_bulk_edit] => 1
                    [author] => 1
                )

            [filter] => 
        )

    [1] => WP_User Object
        (
            [data] => stdClass Object
                (
                    [ID] => 4
                    [user_login] => Tammy Day
                    [user_pass] => $P$BejydpFxKDp60WruV71u0/JnJm9o.E.
                    [user_nicename] => tammy-day
                    [user_email] => tammy.day@dpa.dev
                    [user_url] => 
                    [user_registered] => 2014-08-28 10:57:23
                    [user_activation_key] => 
                    [user_status] => 0
                    [display_name] => Tammy Day
                )

            [ID] => 4
            [caps] => Array
                (
                    [author] => 1
                )

等

我想使用这些结果为ID {。<}执行foreach

E.g。

foreach ( $authors as $author_id ) {

但我不知道如何访问ID。我试过了：

foreach ( $authors->ID as $author_id ) {

但显然这不起作用，因为之前有一个数字，是否有相当于：

foreach ( $authors['X']->ID as $author_id ) {

我可以用吗？

对不起我知道这可能是一个愚蠢的问题，但我很困惑。我知道我可能不得不在foreach中做一个foreach，但我根本无法解决语法问题。

Answer 1

你不能尝试这个而不是foreach：

$i=0;
while ($i<count($authors)){
$author_id = $authors[$i]['data']['id'];
//Do whatever you want here.
$i=$i+1;
}

Answer 2

如转储所述，数组元素是WP_User的实例。您可以使用以下循环来获取ID：

foreach ($authors as $User) {
    $author_id = $User->ID;
    // Act
}

有关WP_User类的参考，请参阅http://codex.wordpress.org/Class_Reference/WP_User

Answer 3

foreach (array_expression as $value)

     

在每次迭代中，当前元素的值被赋值为$ value，内部数组指针被提前一个（因此在下一次迭代中，您将查看下一个元素）。

阅读this文档页面，详细了解foreach循环：

在您的情况下，$ value将指向WP_User Object的实例。要访问用户的ID，只需阅读对象的属性ID

即可

foreach ( $authors as $author ) {
    $author_id = $author->ID;
}